Fourth, the optical drive term explains the CLV technology: constant-linear-velocity) Constant line speed reading method. The technique used in a 25-fold optical drive. It is to keep the data transfer rate unchanged, and change the speed of the rotating disc at any time. Reading the rotational speed along the inner data is much faster than the outside. CAV Technology: Constant-angular-velocity) Constant angular speed reading mode. It uses the same speed to read data on the disc. However, the inner edge data on the optical disc is lower than that of the outer edge data transmission speed, and the more it can reflect the speed of the optical drive, and the speed refers to the highest data transmission rate. PCAV technology: (Partial-Cav) region constant angular speed reading method. It is a new technology that combines CLV and CAV, which is a CAV technology using the outer edge data, and the in-line data is used to improve the speed of the overall data transmission. UDMA mode: (ULTRA-DMA / 33) The usage of CPU resources. Nowadays, UDMA / 66 appears, twice the speed. PIOM mode: (Pio-Mode) previously employed data transmission mode, each operation can be completed, occupying a large number of resources in the CPU. SCIC interface: (Small-Computer-Sysem-Interface) is a new type of external interface that drives multiple external devices; the data transfer rate can reach 40MB, and will become the standard of external interfaces, and the price is expensive. However, less CPU resources are small, and the work is stable. IDE interface: (Integrated-Drive-Electronics) is an external interface that is generally used, mainly connected hard drives and optical drives. The 16-bit data is used in parallel, the size is small, and the data is quickly transmitted. One IDE interface can only be connected to two external devices. Betal: Refers to the optical drive data transmission rate, the International Electronic Industry Association sets 150 k / s data transfer rate as a single speed optical drive. The data transfer rate of 300kb / s is double speed. The result was calculated in turn. Data Transmission rate: (Data-Transfer-Rate) means that the amount of data that can read how many kilobytes (kilobytes) can be read on the disc in the optical drive, and directly determines the speed of the optical drive. The data transfer rate of a single speed optical drive is 150kb / s. Average read time: (Average-seek-time) means that after the laser head moves to the specified pre-read data (this time is Rotation-Latency), start reading data, then transfer data to the circuit on the circuit. time. It is also an important indicator of the optical drive speed. Cache Capacity: It provides a data buffer that is temporarily stored first and then transmits one-time delivery. Solve speed matching gaps with other devices. Laser Head: It moves outward in the Table-of-Contents area, by transmitting a laser to find a designated position on the optical disc, and the sensing resistor is subjected to reflected signals to the electronic data CD: (Compact-DISC) disc.
The CD is LIAD-IN (the location of the data starts recorded); and then the Table-of-Contents area, the inside and outside the data; after the recording, a tag of the data rail end record is added to the record. In the CD CD, the simulation data engraves a small pit that can't even see many even the naked eye through a large burner. CD-da: (cd-audio) is used to store light and flyfall pieces of digital sound. In 1982, SONY, PHILIPS established a red book standard to store sound data in a track. CD-ROM is compatible with this specifications. CD-G: (Compact-Disc-Graphics) CD-DA is based on the graphic to another format, but failed to promote. It is an attempt to multimedia computers. CD-ROM: (Compact-Disc-Read-Only-Memory) Read-only CDM. In 1986, Sony, Philips developed the Huang Jun Standard, defined the archive information format. The MODE1 for computer data storage and two types used to compress the video image storage are defined to make the CD a generic storage medium. And add the quotation code and correction code alignment to ensure that the computer data can be completely read. CD-PLUS: 1994, Microsoft announced the standard of new enhanced CDs, also known as CD-ELURE. It is the first track of CD-AUDIO sound in the CD, and then the information file, so that CD will only read the front track, not read the data rail, reach the benefits of the computer and audio. CD-ROM XA: (CD-ROM-EXTENDED-Architecture) 1989, Sony, Philips, MICUOFT to expand the white paper standard for CD-ROM standard. It is divided into four and one enhanced CD standard CD . VCD: (Video-CD) Laser Disc. Sony, Philips, JVC, MATSHITA, etc. are developed and belong to the white paper standard. It is a laser film and television disc that refers to full dynamics, full screen. The CD-I: (Compact-Disc-Interactive) year is the green paper standard for Philips, Sony. It is an interactive disc system. In 1992, a full dynamic video image played PHOTO-CD: 1989, Kodak launched the orange book standard for photo discs, and can save 100 high-resolution photos with five formats. Can add the corresponding explanations and background music or episodes, becoming a sound electronics photo set. CD-R: (Compact-Disc-Recordable) In 1990, Philips issued a multi-segment one-time write CD data format. It belongs to the standard of oranges. Add a layer that can be recorded at one time on the optical disc, which can be burned. CD-RW: Add a layer of rewritten layer on the optical disc to repeatedly write data multiple times by laser. SDCD: (Super-Density-CD) is Toshiba, Hitachi, Pioneer, Panasonic, Mitsubishi, Timewamer et al. Double-sided 5GB of storage, data compression ratio is not high MMCD: (Multi-MDeiA-CD) is a multimedia CD, which is made by Sony, Philips, etc., single-sided 3.7GB storage, data compression is relatively high.
